Fix typo in example output.

noah-freitas · noah-freitas · commit 5090eebb2ee6 · 2015-03-18T19:20:12.000-07:00
diff --git a/doc/api/core/operators/concatproto.md b/doc/api/core/operators/concatproto.md
@@ -47,7 +47,7 @@ var subscription = source.subscribe(
     });
 
 // => Next: 42
-// => Next: 542
+// => Next: 42
 // => Completed
 ```
 ### Location
